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If lines y=(2a-5)x-5 and 9y=(a+2)x-3 are perpendicular, what are all the possible values of a? Express your answers in decreasing order, separated by commas.

 Apr 1, 2020
 #1
avatar+202 
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First put both equations in slope-intercept form to express the slope in terms of a.

Then multiply them together and set that product equal to -1 (The product of the slopes of two perpendicular lines is, for the most part, -1)

Then you solve for a using the quadratic formula or factoring.

 Apr 1, 2020
 #2
avatar+339 
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This might help: 

https://web2.0calc.com/questions/help-in-quadratic-graphing

:)

 Apr 1, 2020
 #3
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Thank you!

ILoveMySocks  Apr 1, 2020

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